Vacuum-pump.



No. 796,415 PATENTED AUG, 8, 1905.

' J. O. DEAN.

VACUUM PUMP.

APPLIOATION IILED JAN. 9. 1904.

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No. 796,415. PATENTED AUG. 8, 1905- J. G. DEAN.

VACUUM PUMP.

APPLICATION FILED JAN. 9, 1904.

2 SHEETS-SHEET 2 E'woewtoz John C.Dean

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UNITED STATES PATENT OFFIOE.

JOHN O. DEAN, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO DEAN BROTHERS STEAM PUMP WORKS, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

VACUUM-PUMP.

Specification of Letters Patent.

Patented Aug. 8, 1905.

To all whom, it may concern:

Be it known that I, JOHN C. DEAN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Vacuum-Pumps, of which the following is a specification.

The object of my invention is to produce a simple and efficient mechanism by means of which a vacuum may be maintained in a condensing or separating chamber and the liquid continuously withdrawn, the arrangement being such that the gas and the liquid are carried off separately.

The accompanying drawings illustrate my invention.

Figure 1 is a section of a vertical type; Fig. 2, a similar section of a horizontal type; Fig. 8, a section on line 3 3 of Fig. 1, and Fig. 4 a section on line 4 4 of Fig. 1.

In the drawings, 10 indicates a chamber of any desired form. Into said chamber may be introduced, if desired, through a suita le spraying-rose 11 a suitable liquid, such as water, for facilitating condensation. The chamber may be of any desired type and is only here shown for the purpose of illustrating the connections between the same and my improved device.

In the form of my invention illustrated I provide a pump-cylinder 12, in which is mounted a suitable piston 13, provided with a suitable piston-rod'14c, which may be operated in any desired manner, either mechanically or by attachment to a steam or other piston. The walls of cylinder 12 are perforated by two sets of port-openings 15 and 16, which lead, respectively, to annular chambers 15' and 16, formed for convenience of manufacture in a casting 17, within which the cylinder 12 is placed. The two chambers 15 and 16 have no communication with each other. lhamber 15 is provided with an inlet 15", which is adapted to be connected with the lower or fluid outlet of the chamber 10. Chamber 16 is adapted to be connected by pipes 16 with the upper or gas end of the chamber 10. The piston 131s of such length that as it is moved in the cylinder the ports 15 and 16 will never be simultaneously uncovered, but instead will be uncovered by the movement of the piston at opposite ends of its stroke.

Leading from that end of cylinder 12 which communicates with ports 15 is an outlet 18, which discharges through a suitable valve 19. That end of cylinder12 which communicates with port 16 is separated from a chamber 20 by means of a head 21, provided with suitable ports covered by the valves 22.

In operation the fluid from chamber 10 passes therefrom into chamber 15, but with the piston in the position shown in Fig. 1 is prevented from flowing into cylinder 12. As the piston 13 is moved from the position shown the ports 16 are covered, thus closing communication between the chamber 10 and this end of the cylinder 12, and the gas, air, and vapor in cylinder 12 are forced out through valves 22. When the piston has reached this end of its stroke, the ports 15 are uncovered and the fluid passes into cylinder 12 and outlet 18. A movement of the piston 13 in the opposite direction first covers ports 15 and thereafter forces the fluid from cylinder 12 through valve 19. As this movement of the piston takes place a vacuum is created in the opposite end of cylinder 12, so that when ports 16 are uncovered the air, gas, and vapor in chamber 10 passes over into cylinder 12. The reciprocation of the single piston 13 thus operates to separate the gas, air, and vapor from the liquid in the chamber 10 and also to move said gas, air, and vapor and the liquid separately into opposite ends of the pump-cylinder and to separately discharge them. As a consequence, a higher degree of vacuum may be obtained in the condenser and a consequent increase of efficiency.

I claim as my invention 1. The combination, with areceiving-chamber adapted to receive liquid and gas, of a single cylinder and a piston mounted therein, I

a connection between the liquid side of the chamber and one end of the said single cylinder, an independent connection between the gas side of the chamber and the other end of said cylinder, and independent eduction-passages for the two ends of the cylinder, for the purpose set forth.

2. In a pump of the class described, the combination, with a single cylinderv having two independent sets of adjacent inductionports leading thereinto at its middle, of a piston mounted insaid cylinder and arranged so that at the endsof its stroke it will cover one set of ports while leaving the other uncovered, eduction openings leading from each end of the cylinder, and valves covering said eduction-openings.

3. In a pump of the class described, the combination with a single cylinder having a Water end and an air end and having an induction-port leading into the Water end, an eduction-port leading from said Water end, an independent induction-port leading into the air end, and an independent eduction-port leading from said air end; of a piston mounted in said cylinder, the arrangement being such that admission into the air end through the admission-port does not take place until after a vacuum has been created in the air end by the return stroke of the piston.

4. In a pump of the class described, the combination of a single cylinder, and a piston mounted therein, the said cylinder having a Water end and an air end, an induction-port leading into the Water end, an eduction-port leading from the water end, an eduction-port leading from theair end, and an induction- JOHN C. DEAN. [L s] Witnesses:

ARTHUR M. HOOD, JAMEs A. WALSH. 

